Remove @GrabResolvers before packaging jar in CLI

Since all dependencies are local in a jar there is no need for
a GrabResolver (and it breaks the app because the default ivy
GrapeEngine is used instead of the smart, pretty Boot one).

Fixes gh-1179

spring-boot-cli/src/it/resources/jar-command/bad.groovy

@@ -0,0 +1,6 @@
+@GrabResolver(name='clojars.org', root='http://clojars.org/repo')
+@Grab('redis.embedded:embedded-redis:0.2')
+
+@Component
+class EmbeddedRedis {
+}